On an global level, he won two European Championships (in 2008 and 2012) and was also part of the La Roja squad which won the 2010 World Cup in South Africa.
The 2016-17 French champions, mired in Ligue 1's relegation zone, had initially elected not to sign the former Nantes and Roma midfielder from Antalyaspor because of a calf injury.
"We are very pleased to welcome Cesc Fabregas to AS Monaco, a world-class player and a great professional, whose arrival demonstrates the ambition of the club", club vice-president Vadim Vasilyev said in a statement.
"Wow. I'm honored to announce that I will be starting an exciting journey with this wonderfully historic club. I am very excited".More news: Justice Ginsburg to Miss Arguments Next Week, Recovery 'On Track'
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Cesc Fabregas has left Chelsea to join Monaco in a £10million deal.
However, his deal to the Ligue 1 side will see him re-unite with his former Arsenal teammate Thierry Henry, who is in charge of the club. But I really wanted to wear Monegasque colors so I spontaneously proposed to the club to make every effort to evolve in Monaco.
Monaco's next game is against Marseille on Sunday but a home tie against OGC Nice on Wednesday evening.
Regardless, though, two replacement targets have already been doing the rounds in the media and it seems Chelsea have their heart set on either Leandro Paredes or Nicolo Barella.
TUKO.co.ke earlier reported that Chelsea were not to sell Spanish midfielder Fabregas until they buy a good replacement for the ex-Arsenal captain.